�tude th�orique et exp�rimentale de l'�coulement engendr� par un cylindre en translation uniforme dans un fluide visqueux en r�gime de Stokes

Bouard, R.; Coutanceau, Madeleine

doi:10.1007/bf00947915

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…Firstly, all the results, including the ÿ-phenomenon, previously detected either numerically or by experiment visualization [5,6], have been reproduced in detail in the preliminary non-deformable case. We showed that the wall deformation created a secondary radial ow at the neighbourhood of the surface cylinder [4,7].…”

Section: Resultsmentioning

confidence: 97%

Numerical simulation and experimental visualization of the influence of the deformation frequency of a radially deforming circular cylinder impulsively started on cylinder wake

Hanchi¹,

Oualli²,

Askovic³

et al. 2003

Numerical Methods in Fluids

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SUMMARYA periodic superimposed motion may notably in uence the ow structure and the development of the convective heat transfer relative to non-deformable case. In particular, a radial deformation of a circular cylinder, may cause a possible synchronization with the cylinder wake, which is itself periodic when Vortex Street takes place. This synchronization phenomenon, often called 'lock-in', may cause undesirable e ects, but may also constitute a way of controlling the wake development.Body deformability may be used as wake control device that would favourably a ect the interplay of primary and secondary vorticities, thus reducing the drag coe cient. These numerical and experimental studies are done herein for a Reynolds number equal to 23500. The problem is resolved by using the Navier-Stokes equations in the vorticity-stream function form. The vorticity transport equation is solved by a second-order ÿnite di erence method in both directions of the domains. The Poisson equation for the stream-function is solved by a SOR method. The advance in time is achieved by a second-order Adams-Bashforth scheme. The e ect of turbulence is represented by eddy viscosity t , which is determined by a sub-grid-scale model. In the present study, we use a Smagorinsky model.

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Section: Resultsmentioning

confidence: 97%

Numerical simulation and experimental visualization of the influence of the deformation frequency of a radially deforming circular cylinder impulsively started on cylinder wake

Hanchi¹,

Oualli²,

Askovic³

et al. 2003

Numerical Methods in Fluids

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“…It is continuous at the interface and its maximum value is reached at the stagnation point. In order to compare our results with the theoretical results of Bouard and Coutanceau [18], we have transformed our results so that they are compliant with a Lagrangian frame of reference, that of a fixed particle and moving walls. In Figure 5, a graph representing the variation of the fluid velocity upstream of the particle, along a horizontal line, is presented.…”

Section: Validationmentioning

confidence: 83%

“…This problem has been studied both experimentally and theoretically by Bouard and Coutanceau [18]. Here, special attention is given to the product of the Cd number and the Reynolds number and its relationship with the particle diameter to channel width ratio.…”

Section: Validationmentioning

confidence: 99%

A numerical continuous model for the hydrodynamics of fluid particle systems

Ritz

Caltagirone

1999

Int. J. Numer. Meth. Fluids

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“…Cette technique numérique de minimisation quadratique á eté initialement proposée pourécrire les conditions aux limites par Bourot [21]; elle est depuis lors utilisée avec succès pour traiter des problèmes divers: Coutanceau et Thizon [22] pour le comportement des bulles et gouttes en présence de paroi, Bouard et Coutanceau [23] pour le cylindre en translation, Maalouf et Bouard [24] pour les milieux poreux, etc. .…”

Section: Ecoulements Cellulaires De Stokes 939unclassified

Ecoulements cellulaires de Stokes générés par rotation dans un canal coaxial

Hajjam¹

1998

Z. angew. Math. Phys.

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Onétudie numériquement la structure cellulaire d'une catégorie d'écoulements bidimensionnels de Stokes, générés par la rotation d'un cylindre dans l'entrefer d'un canal formé de deux cylindres circulaires fixes et concentriques. La naissance et le développement des cellules de recirculation, résultant du phénomène de décollement induit dans ce type d'écoulements, sont analysés en détailà travers l'évolution des lignes de courant et plus particulièrement des lignes séparatrices, pour différents rapports d'obturation et quelle que soit la position de la source de mouvement dans l'entrefer.Abstract. The cellular structure of two-dimensional Stokes flows induced by a rotating cylinder in an annular tank made of concentric circular cylinders is studied numerically. The occurrence and development of the recirculating-cells resulting from the separation phenomenon are thoroughly analysed through the evolution of streamlines and streamline separation patterns, for different obstruction ratios whatever the position of the source of motion in the gap may be.

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�tude th�orique et exp�rimentale de l'�coulement engendr� par un cylindre en translation uniforme dans un fluide visqueux en r�gime de Stokes

Cited by 19 publications

References 9 publications

Numerical simulation and experimental visualization of the influence of the deformation frequency of a radially deforming circular cylinder impulsively started on cylinder wake

Numerical simulation and experimental visualization of the influence of the deformation frequency of a radially deforming circular cylinder impulsively started on cylinder wake

A numerical continuous model for the hydrodynamics of fluid particle systems

Ecoulements cellulaires de Stokes générés par rotation dans un canal coaxial

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